OK, sorry. I just thought someone may be interested. I didn't list them as I stated before and there is no good picture of the top. Maybe that's why.

----- ORIGINAL MESSAGE FOLLOWS -----

----- ORIGINAL MESSAGE FOLLOWS -----There is a set of tanks on ebay. Below is his response to a query on the casting numbers. I assume the left is Super X and interchangeable with the Henderson. Let me know if this is wrong. There is no reserve on these and the current price is a lot less than some have been asking recently. Item #330495624842. I don't know the guy so proceed at your own risk.

LEFT TANK IS PA OR P4-10200 & RIGHT TANK IS KJ5225

WRONG WRONG WRONG. THE LEFT TANK IS NOT INTERCHANGEABLE UNLESS YOU WANT AN EXTERNAL OIL TANK ON YOUR HENDERSON . THE SUPER X LEFT TANK HAS AN OIL COMPARTMENT AND 2 FILLERS AND A PUMP ON THE LEFT TANK